<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="../css/reset.css">
    <style>
        .box {
            /* width: 100%;
            height: 100%; */
            background-color: #ff0;

            position: fixed;

            left: 0;
            right: 0;
            top: 0;
            bottom: 0;
            margin: auto;


            /* left: 50%;
            top: 50%;
            transform: translate(-50%,-50%); */
        }
    </style>
</head>

<body>
    <div class="box">1111111111</div>
</body>

</html>